A plane with a wingspan of 35.0 m is flying horizontally at a speed of 280 m/s over a location where the Earth's magnetic field is 45.0 ?T at 55° below the horizontal. What voltage is generated between the wingtips?
a. 3.6E–1 V
b. 2.5E–1 V
c. 6.3E–1 V
d. 4.4E–1 V
a
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If the density of the universe equals the critical density, then the Universe must be ___________ (i.e., having zero curvature)
Fill in the blank(s) with correct word
We can't detect stellar parallax with naked-eye observations. Which of the following would make parallax easier to observe?
A) increasing the size of Earth's orbit B) speeding up Earth's rotational motion C) slowing down Earth's rotational motion D) speeding up the precession of Earth's axis E) getting away from streetlights
James and John dive from an overhang into the lake below. James simply drops straight down from the edge. John takes a running start and jumps with an initial horizontal velocity of 25 m/s. Compare the time it takes each to reach the lake below
A) James reaches the surface of the lake first. B) John reaches the surface of the lake first. C) James and John will reach the surface of the lake at the same time. D) Cannot be determined without knowing the mass of both James and John. E) Cannot be determined without knowing the weight of both James and John.
A transformer is a device used to
A) transform an alternating current into a direct current. B) transform a direct current into an alternating current. C) increase or decrease an ac voltage. D) increase or decrease a dc voltage.